Trắc nghiệm: Some methods to prevent soil erosion are plowing parallel with the slope of hills. to plant trees on unproductive land. and rotating crops.,Some methods to prevent soil erosion are plowing parallel with the slope of hills. to plant trees on unproductive land. and rotating crops

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Some methods to prevent soil erosion are plowing parallel with the slope of hills. to plant trees on unproductive land. and rotating crops., Some methods to prevent soil erosion are plowing parallel with the slope of hills. to plant trees on unproductive land. and rotating crops

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